Compressed-air pump



' H. NIANDELBAUM COMPRESSE!) AIR PUMP.

APPLICATION FILED APR. I8. 1919.

WITNESS: I N V EN TOR.

Yof Fig. 4. l

Referring toV the drawings wherein is' UNITED STATES PATENT OFFICE.

HENRY MANDELBAUM, 0F BROOKLYN, NEW YORK.

ooMPREssnn-AIR PUMP.

specification 0f Letters Patent.

Patented Sept. 7, A1920.

Application led ,April 18, 1919. Seria1;No..291,11'7.

To all whom t may concern Y Be v1t known that I, HENRY MANDELBAUM,

a citizen of theUnited States, residing at- Brooklyinin the county of Kings and State of New York, have invented certain newv the wheels of the car ina manner that willl cause the stoppingof the car to be easy and gradual so that sudden and jerky move ment will be prevented.

The invention further aimsk to provide a brake apparatus which will operate to compress air in suitably located cylinders, the apparatus being provided with an arrangement which may be manually operated for causing the compressed air to be emitted or exhausted through pipes leading to a turbine or other power apparatus whereby the exhaust compressed air may be employed to operate the turbine for developing power to generate electricity.

The above and additional objects are accomplished by suchl means as are illustrated '1 V1n the preferred embodiment and in the accompanying drawings, whereinlike characters of reference `indicate corresponding parts throughout the several views, in which: Y

Figure 1 is a side elevation of the appa ratus constructed in accordance with my inventicn, parts being shownin section.

Fig. 2 is a plan view vof the same, parts being broken away to Amore clearly` disclose the structure. n

Fig. 3 is ran endelevation.

Fig. 4 is a detailed view of the slide valve operating mechanism, and

I* 5 is a section takenon the line 5 5 illustrated the preferred form of my invention, Vin which like numerals or" reference indicate like or corresponding parts throughout the severalviews, the railroad car is provided with the usual supporting wheels 1 and 2 mounted upon the axles 3 Aand 4 which rotate with the wheels. Each axle is provided with a gear 5 loosely mounted upon the axle and having integrally formed therewith or otherwise secured thereto, a clutch element 6, the complementary member T of which is slidably mounted on the axle. The slidably mounted member 7 is keyed to the axle and each is embraced by a fork member 8 which may be actuated to lslide the clutch into operative position.

. As shown to advantage in Fig. 2, the fork members 8 are inthe form Aof bell crank levers pivotally mounted on brackets 9 and Y having their opposite ends joined to an operating -rod 10, one end of which projects into a clutch actuating cylinder 11. Vith- 'in the cylinder 11 is a piston l2 connected Y to .the rod 10 and a coil expansion spring 13 is interposed between one end of the cylinder 11 and the end of the piston 12 so Y that the `piston 12 isnormally urged rtoward the opposite end or" the cylinder to force the rod 10 outwardly whereby the bell crank .leverfmay be actuated to move the clutch element into operative engagement. The spring 13, therefore,racts to maintain the clutch elements in operative position whereby the gear 5 will be rotated. Counter shafts 14 are disposed directly above the axles 3 and 4 and are journaled in suitably located brackets or supports, and each counter shaft carries a gear l5 vadapted to mesh with the adjacent gear 5. Each gear 15 is provided with an axially projecting pin 16 radially spaced from the center of theshaft and a connecting rod 17 connects the gears through the medium of the pin 16,

.so tlnttreciprocatory movement will be imparted to the rod 17 when the gears are rotated. A compression cylinder 18 is supported on a bracket 19 and is provided on its interior with a piston 2O equippedv with a piston rod 21 the outer end of which is joined by a pitman 22 to one endof the rod V17. A check valve 23 is mounted adjacent an opening 24 in one end of the cylinder and a similar check valve 25 operates adja cent another opening 26 in the opposite end of the cylinder. These valves are designedV to open to draw air into the cylinder when the piston 20 moves away from the corresponding end of the cylinder and will close when the piston 20 moves toward the end or" the cylinder in which they are mounted.

On the top of the cylinder 18 is av slide valve casing 27 within which is arranged a slide valve 28 having projections 29 and 30 disposed to open and close openings 31 and 32 respectively in the top of the Vcylinder 18. These projections 29 and 3() are spaced from each other so that when projection 29 closes the opening 31, the ropening 32 will be unobstructed and vice versa. A valve rod'33 .is connected to the slide valve and proj ects'through one end of the valve casing and this valve rod is operated by an arm 34 carried by the piston rod 21. Y

As shown to advantage in Figs. 4 and 5 the arm 34 is provided with a slot 35 through which one end of the arm of the valve rod 33 projects. enough to receive a block 36 which is urged into engagement with the top surface of the valve rod 33 by a coil expansion spring 37 interposed between'one end of the slot and the upper surface of the block 36. As shown in Fig. 4 the block 36 will slide on the rod 33 when any resistance to movement is offered by the rod 33, but will cause the rod 33 to move if no resistance is offered by it. 1n other words, the slide valve 28 is only required to move a relatively short distance whereas the arm 34 is obliged to move a longer distance by virtue of the longer movement of the piston 20. When the valve 28 has moved to its limit of movement, however, the frictional engagement of the block Y 36 w'th the valve rod 33 will permit the block 'to slide along the rod 33 until the piston 20 has reached one end of the cylinder. 1n this manner the valve 28 may be reciprocated upon each reciprocation of the piston 20. From the above it will be seen that when the piston 20 (referring to Fig. 1) is traveling to the right the rod 33 will be pulled to the right thus causing the projection 29 to close the opening 31 While the projection 30 will have passed away from the opening 32'sol as to not obstruct same and while the piston 20 is traveling to the left this operation will be reversed so that the projections will take the position as shown in Fig. 1 of the drawing that is the opening 31 will be unobstructed while the opening 32 will be closed by the projection 30.

YThe slide valve casing 27 is connected by a pipe or air hose 38 to a longitudinally extending pipe 39 supported in the brackets 40, and a branch pipe 41 extends from the pipe 39 to a control box 42 of conventional form supported in any convenient manner on the car. The clutch cylinder 11 is' connected by a pipe or air hose 43 to a longitudinally extending pipe 44 also supported in the brackets 40and provided with a branch pipe 45 leading upwardly to the control box 42. The ends of the pipes 39 and 44 at the ends of the car, may be cou- The slot 35 is large pled to the proximate ends of the similar pipes on an adjacent car in a train.

A compressed air turbine 4G is secured to the bottom of the car and is provided with an inlet pipe 47 leading from a longitudinally extending pipe 48 which is parallel to the pipes 39 and 44 and is supported in the brackets 40. This pipe 48 is also provided with a branch pipe 49 leading to the control box 42.

The controlling box 42 contains the appa` ratus for controlling the compressed air and may be operated by the motorman or other authorized person to stop the car or govern its speed while inmotion.

The control box may also be operated so as to form a communication between the pipes 49 and 45. The pressure normally maintained in the clutch cylinder 11 behind the piston 12` will thereby be released through the air hose 43, pipe 44, branch pipe 45 through the control box, thence through the' branch pipe 49 and the pipe 48 and into the turbine 46 through the medium of the connecting pipe 47. r1`he compressed an thus permitted to pass into the turbine will cause the latter to be actuated and power may thus be obtained for driving a conveniently located dynamo or other apparatus. The spring 137 within the cylinder 11, will act to force the piston 12 outwardly when the air pressure is thus released and the action of the piston will move the rod 10 .for swinging the bell crank levers 8 which in the compression cylinder' 18. This compression occurs upon each reciprocaticn of the piston 20 since the valves 23 and 25 are arranged to automatically open and close as the piston is reciprocated so that compressed air is forced into the chamber in the housing 27. The slide valve 28 having the projections 29 and 30 is so timed as to open and close the openings 31 and 32 at the proper intervals whereby the compressed air will be forced into the chamber in the housing 27 as the piston 2O is reciprocated and into the hose 38 which leads to the pipe 39. As the air pressure increases, the rota.- tion of the gears will be retarded and since the increase in pressure is gradual it will be obvious that the stopping of the car will be gradual and when the air pressure reaches a certain degree the gears will be stopped, the car also stopping and this will be accomplished so gradually and easily that jerky movement and excessive strain on the apparatus may be avoided. The operatorv will then move the controller handle so that the pi )e 9 will be in communicationwith Ll through the control box 42 thereby permitting' the compressed air to pass through the pipe 48 and into the turbine 46 through the connecting pipe 4.7. This exhaust of the air int-o the turbine has a double purpose. Vlt not only serves to drive the turbine for developing power to drive a dynamo or the like but also prevents the exhaust of the compressed air too suddenly since the resistance by the turbine will prevent the sudden expulsion of the compressed air from the pipe 4S.

rThe 1oregoing description and accompanying' drawings have reference to what inie'ht be considered to be the approved or prelerred form of my invention. l desire it to be understood that I may make such changes in the construction, combination and arrangement of parts7 materials, dimensions7 et cetera, as may prove expedient and tall within the scope of the appended claims.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent, is

l, An air compressor including a reciprocatory piston, a piston rod attached to said piston,A means for reciprocating said piston, a valve casing mounted upon said air compressor, a slide valve situated within said casing, a valve rod extending from said valve, an arm attached to said piston rod and having' a slot adapted to receive the valve rod, a block situated within said slot, and means provided for forcing said block in frictional engagement with said valve rod.

An air compressor including a reciprocatory piston, means for reciprocating said piston, a valve rod attached to said piston, a valve casing` mounted upon said air compressore a slide valve mounted within said casing, a valve rod extending from said valve, an arm attached to said piston rod and having a slot therein for receiving` said valve rod, a block situated within said slot and adapted to bear against said valve rod, a coil expansive spring interposed be tween one end of said slot and one surface or' said block.

n testimony whereot1 I aiiix my signature in presence 0i two witnesses.

HENR Y MANDELBAUM.

Witnesses Moens ZANGER, HERMAN MANDELBAUM. 

